Classify the following triangles according to angle :

1.	Classify the following triangles according to angle :
Answer» (i) Since, it has an obtuse angle of 120° Hence, it is an obtuse-angled triangle. (ii) Since, all the angle of a triangle is less than 90°. Hence, it is an acute angled triangle. (iii) Since ∠MNL = 90°, and sum of two acute angle ∠M + ∠N = 30° + 60° = 90°. Hence, it is a right-angled triangle.

Answer»

(i) Since, it has an obtuse angle of 120°

Hence, it is an obtuse-angled triangle.

(ii) Since, all the angle of a triangle is less than 90°.

Hence, it is an acute angled triangle.

(iii) Since ∠MNL = 90°, and sum of two acute angle ∠M + ∠N = 30° + 60° = 90°.

Hence, it is a right-angled triangle.

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